72163404 has 18 divisors (see below), whose sum is σ = 182413140. Its totient is φ = 24054456.

The previous prime is 72163393. The next prime is 72163409. The reversal of 72163404 is 40436127.

72163404 is a `hidden beast` number, since 7 + 21 + 634 + 0 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (72163409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1002234 + ... + 1002305.

Almost surely, 2^72163404 is an apocalyptic number.

It is an amenable number.

72163404 is an abundant number, since it is smaller than the sum of its proper divisors (110249736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72163404 is a wasteful number, since it uses less digits than its factorization.

72163404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004549 (or 2004544 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 72163404 is about 8494.9045904001. The cubic root of 72163404 is about 416.3312435094.

The spelling of 72163404 in words is "seventy-two million, one hundred sixty-three thousand, four hundred four".